Note that the SSL connection is available only for the version 2.4 + of
MongoDB.

Set read preference

Select this check box and from the Read preference
drop-down list that is displayed, select the member to which you need to direct the read
operations.

If you leave this check box clear, the Job uses the default Read preference, that is to
say, uses the primary member in a replica set.

For further information, see MongoDB's documentation about Replication and its Read
preferences.

Required authentication

Select this check box to enable the database authentication.

Among the mechanisms listed on the Authentication mechanism
drop-down list, the NEGOTIATE one is recommended if
you are not using Kerberos, because it automatically select the authentication mechanism
the most adapted to the MongoDB version you are using.

For details about the other mechanisms in this list, see MongoDB Authentication from the MongoDB
documentation.

Set Authentication database

If the username to be used to connect to MongoDB has been created in a specific
Authentication database of MongoDB, select this check box to enter the name of this
Authentication database in the Authentication database
field that is displayed.

To enter the password, click the [...] button next to the
password field, and then in the pop-up dialog box enter the password between double quotes
and click OK to save the settings.

Available when the Required
authentication check box is selected.

If the security system you have selected from the Authentication mechanism drop-down list is Kerberos, you need to
enter the User principal, the Realm and the KDC
server fields instead of the Username and the Password
fields.

Bucket

Enter the name of the bucket you need to write files in. A bucket of
GridFS is similar to a folder.

Local Folder

Browse to, or enter the path to the folder in which the files to be copied and written
to GridFS are stored.

Use Perl5 Regex Expression as
Filemask

Select this check box if you want to use Perl5 regular expressions in the Files field as file
filters. This is useful when the name of the file to be used contains special characters
such as parentheses.

- File mask: type in the file
name to be selected from the local directory. Regular expression is
available.

- New name: give a new name to
the loaded file.

Advanced settings

tStatCatcher Statistics

Select this check box to collect the log data at the component
level.

No query timeout

Select this check box to prevent MongoDB servers from stopping idle
cursors at the end of 10-minute inactivity of these cursors. In this
situation, an idle cursor will stay open until either the results of
this cursor are exhausted or you manually close it using the
cursor.close() method.

A cursor for MongoDB is a pointer to the result set of a query. By
default, that is to say, with this check box being clear, a MongoDB
server automatically stops idle cursors after a given inactivity period
to avoid excess memory use. For further information about MongoDB
cursors, see https://docs.mongodb.org/manual/core/cursors/.

Global Variables

Global Variables

NB_FILE: the number of files processed. This is an After
variable and it returns an integer.

ERROR_MESSAGE: the error message generated by the
component when an error occurs. This is an After variable and it returns a string. This
variable functions only if the Die on error check box is
cleared, if the component has this check box.

A Flow variable functions during the execution of a component while an After variable
functions after the execution of the component.

To fill up a field or expression with a variable, press Ctrl +
Space to access the variable list and choose the variable to use from it.

For further information about variables, see Talend StudioUser Guide.

Usage

Usage rule

This component combines MongoDB GridFS connection and data extraction, thus usually
used as a single-component subJob to copy data from a user-defined local
directory to GridFS.

It is often connected to the Job using OnSubjobOk or OnComponentOk link, depending on the context.